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2000 mw 445nm vs 300 mw 532 nm brightness?

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MisterClang

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I was wondering which of the two lasers would be brighter the 2000 mw 445nm or the 300 mw 532 nm? Thanks
 





Eudaimonium

Eudaimonium

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Hm, that's tough, I think they're close enough that the answer might actually vary from person to person, but personally I think the green one's beam is just tad more visible and crisp at night time, as opposed to two-watt 445nm.
 
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trencheel303

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They won't be worlds apart, but in terms of brightness either of them will have a perfectly visible beam if they're working properly. If it's for star pointing in the night sky both will be "too bright" and the wrong colour, as they remove night vision.
 
Eudaimonium

Eudaimonium

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trencheel303 said:
They won't be worlds apart, but in terms of brightness either of them will have a perfectly visible beam if they're working properly. If it's for star pointing in the night sky both will be "too bright" and the wrong colour, as they remove night vision.
Click to expand...

I'd disagree, viewing the beam of anything short of the Death Star won't really ruin your night vision, but yeah just DO NOT point it at some physical object close to you. The dot will ruin it, and require some time to re-adjust.
 
mortuus

mortuus

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hm what nightvision trencheel? if outside i dont see how they would destroy night vision, you could point a 5w blue and it would be ok no ?
 
PainTrane117

PainTrane117

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The color green is perceivably brighter to the human eye, much more so than blue, but like others have said at that power difference it's a tough one, and Shadowsix posted some very useful links. But this little graph is kind of neat to see:
othcs.gif
 
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Blarg King

Blarg King

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Based off of owning a 1400 mW 445 and a 220 mW 532, I would say the 2000 mW 445 would actually be a bit brighter.
 
dubious speculation

dubious speculation

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Personally I think 445nm 2W would be brighter.

As for ruining your night vision, at least for me, my 3W 445nm laser is stupidly overpowering at night. The beam alone completely destroys my night vision and my eyes are left with a persisting after flash of the beam.

For me at least 532nm is much easier on the eyes and the beam appears much cleaner due to the divergence, beam profile and wavelength.
 
Blarg King

Blarg King

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Yeah blue/violet wavelengths are the worst for ruining night vision. The beam itself likely WONT affect your night vision though because its much less bright than the dot and its only a narrow beam so it doesn't fill your vision. If you happen to glance it off something reflective though, the flash of blue light will ruin your night vision.
 
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trencheel303

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Eudaimonium said:
I'd disagree, viewing the beam of anything short of the Death Star won't really ruin your night vision, but yeah just DO NOT point it at some physical object close to you. The dot will ruin it, and require some time to re-adjust.
Click to expand...

Facts are facts. The beam of a sufficiently bright green or blue will temporarily disable night vision. When I was playing with lasers at my favourite dark sky location a few months ago my green and blue did just that. It's to do with the chemical changes in your eye that happens when they adapt to the dark (as well as the basics like dilation) and the effects green or blue light have on the eye in its dark adapted state.


mortuus said:
hm what nightvision trencheel? if outside i dont see how they would destroy night vision, you could point a 5w blue and it would be ok no ?
Click to expand...

A 5mW blue would hardly be visible anyway. A 2W blue has a very bright beam.

Don't forget, true dark skies are very hard to find nowadays. I have to travel hours to get to an almost pitch black sky, and to many who live in large cities and conurbations it might not even be practically possible at all to get to a dark sky.


Blarg King said:
The beam itself likely WONT affect your night vision though because its much less bright than the dot and its only a narrow beam so it doesn't fill your vision.
Click to expand...

Have you tried it for yourself or are you guessing? The beam causes the air around it to glow unless it's a PERFECTLY still and dry night. And yes, the beam alone IS bright enough to ruin true dark night vision.
 
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Rifter

Rifter

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trencheel303 said:
Facts are facts. The beam of a sufficiently bright green or blue will temporarily disable night vision. When I was playing with lasers at my favourite dark sky location a few months ago my green and blue did just that. It's to do with the chemical changes in your eye that happens when they adapt to the dark (as well as the basics like dilation) and the effects green or blue light have on the eye in its dark adapted state.




A 5mW blue would hardly be visible anyway. A 2W blue has a very bright beam.

Don't forget, true dark skies are very hard to find nowadays. I have to travel hours to get to an almost pitch black sky, and to many who live in large cities and conurbations it might not even be practically possible at all to get to a dark sky.




Have you tried it for yourself or are you guessing? The beam causes the air around it to glow unless it's a PERFECTLY still and dry night. And yes, the beam alone IS bright enough to ruin true dark night vision.
Click to expand...

I completely agree only my 660nm red doesn't ruin my night vision.
 
Eudaimonium

Eudaimonium

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Wow, in my experience no lasers ruin my night vision, as I described.

Perhaps it has something to do with local atmospheric conditions? High smog or humidity makes the beam appear as it's glowing more than it actually is?
 
Blarg King

Blarg King

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trencheel303 said:
Have you tried it for yourself or are you guessing? The beam causes the air around it to glow unless it's a PERFECTLY still and dry night. And yes, the beam alone IS bright enough to ruin true dark night vision.
Click to expand...

For me personally, in my fairly extensive time using my lasers outdoors, I haven't had my night vision affected by the beams of my 1.4 Watt 445 or 200 mW 532.

Could just be me though. Everyones eyes work a bit different.
 
Alex2893

Alex2893

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i have a 320mw 532nm laser and a 2000 mw 445mw. green has the brightest spot by far.
the beams can be tricky. depending on which angle you view them at one can look brighter then the other. the other thing is the 445nm has a much thinker beam then the 532nm so it looks more substantial. i like the 532nm beam better. its easier to focus your eyes on
 
NRGLite

NRGLite

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Hey shadowsix my computer detects that site that you linked to as p0rn. :wtf:
Whatever. A 300 mW green is probably brighter. Green is 11 times brighter than blue, meaning that it will be just over 1.3 times brighter. (About)
 
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